Who knows about rear-end gears?

69' stang · 09-26-2006, 10:48 PM

right now my 69's 302 is putting out far more power than my rear end can handle. it has been modified to get between 425 and 450 hp. however, i am not getting this to the rear wheels due to my gears. i was curious if anyone can help as to what the best set of gears would be fro my application.

rwhite65 · 09-27-2006, 10:45 AM

Quote:

Originally Posted by 69' stang

right now my 69's 302 is putting out far more power than my rear end can handle. it has been modified to get between 425 and 450 hp. however, i am not getting this to the rear wheels due to my gears. i was curious if anyone can help as to what the best set of gears would be fro my application.

Not getting it to the rear wheels meaning traction issues? Can you explain a little more?
Ryan

okiedragster · 09-27-2006, 05:14 PM

#1 what gears do you have now? #2 is it auto or std? #3 is it a 9 inch? #4 what do you have in a 302 that is making 425 hp on pump gas?

06_GT_Hawaii · 09-28-2006, 02:49 AM

How do you know the power's not getting to the tires because of the gears, but need help here undderstanding gears?

We'll need more info to help you, but help you we will...

69' stang · 09-30-2006, 01:47 PM

Quote:

Originally Posted by 06_GT_Hawaii

How do you know the power's not getting to the tires because of the gears, but need help here undderstanding gears?

We'll need more info to help you, but help you we will...

69' stang- the previous owner of the car left the stock gears in the rear end but built up the engine, i want to upgrade the gears to get the horses the motor is making to the rear wheels. it is a ford 9 in. i dont know the ratio of the current gears. a mechanic that is helping me on the project suggested 3.80 but i would like a second opinion

rwhite65 · 10-01-2006, 04:18 PM

This is pretty much what you are gonna hear on this board.
An auto usually the 3.80, a manual would get a 4.10 ratio.

Personally, if it were my car and I was not gonna see a lot of highway miles, I would go higher with the 4.10 whether the car was amanual or auto.

If your engine makes a lot of power, but you only have a 3 speed auto or an older 4 speed stick, you could probably get by with the 3.80 and still have a decent cruising rpm.

Ryan

okiedragster · 10-01-2006, 06:03 PM

also if you run a low profile tire or wheels 3.80's are gonna be low too.need to factor in your overall tire or wheel size also. 3.73's are pretty good if you run a 15 inch wheel with a tall tire..

69' stang · 10-01-2006, 10:58 PM

Thanks alot to everyone who has helped me out with my problem

10-01-2006, 04:18 PM	#6
rwhite65 Ride Hard Join Date: Oct 2000 Location: Wyoming IL Posts: 1,094	Re: Who knows about rear-end gears? This is pretty much what you are gonna hear on this board. An auto usually the 3.80, a manual would get a 4.10 ratio. Personally, if it were my car and I was not gonna see a lot of highway miles, I would go higher with the 4.10 whether the car was amanual or auto. If your engine makes a lot of power, but you only have a 3 speed auto or an older 4 speed stick, you could probably get by with the 3.80 and still have a decent cruising rpm. Ryan __________________ 65 Fastback 91 roller 306, H/C/I AOD-Bauman, PI Stallion, 4.10's and traction loc 04 Grand Cherokee Freedom Edition 79 Ford F-250 4x4 - Restored

10-01-2006, 06:03 PM	#7
okiedragster Drag Racer and Mach1 Addict Join Date: Jan 2006 Location: southern oklahoma Posts: 85	Re: Who knows about rear-end gears? also if you run a low profile tire or wheels 3.80's are gonna be low too.need to factor in your overall tire or wheel size also. 3.73's are pretty good if you run a 15 inch wheel with a tall tire.. __________________ -FOR SALE- SUPER COMP DRAGSTER My 71 Mach 1

10-01-2006, 10:58 PM	#8
69' stang Registered Member Join Date: Sep 2006 Posts: 4	Re: Who knows about rear-end gears? Thanks alot to everyone who has helped me out with my problem

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09-26-2006, 10:48 PM	#1
69' stang Registered Member Join Date: Sep 2006 Posts: 4	Who knows about rear-end gears? right now my 69's 302 is putting out far more power than my rear end can handle. it has been modified to get between 425 and 450 hp. however, i am not getting this to the rear wheels due to my gears. i was curious if anyone can help as to what the best set of gears would be fro my application.

09-27-2006, 05:14 PM	#3
okiedragster Drag Racer and Mach1 Addict Join Date: Jan 2006 Location: southern oklahoma Posts: 85	Re: Who knows about rear-end gears? #1 what gears do you have now? #2 is it auto or std? #3 is it a 9 inch? #4 what do you have in a 302 that is making 425 hp on pump gas? __________________ -FOR SALE- SUPER COMP DRAGSTER My 71 Mach 1

09-28-2006, 02:49 AM	#4
06_GT_Hawaii Registered Member Join Date: Mar 2006 Location: Hawaii Posts: 21	Re: Who knows about rear-end gears? How do you know the power's not getting to the tires because of the gears, but need help here undderstanding gears? We'll need more info to help you, but help you we will... __________________ '06 GT Mustang (I am a MOPAR convert) I buy my Mustang stuff at: cafepress.com/mustang_GT HAPPINESS IS 300 HP